Upgrading to Elasticsearch 9: Why Your "Read-Only" 7.x Indices Still Block the Boot
Upgrading to Elasticsearch 9: Why Your "Read-Only" 7.x Indices Still Block the Boot
Daniel Gleim || 2026-09-03
Use Kibana’s Upgrade Assistant to reindex or mark 7.x indices read-only, not just index.blocks.write, or 9.x will still refuse to start.
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Writing Kibana Plugins , Part 5: Adding a User Interface
Jochen Kressin || 2026-08-31
In this last part of our series, we will add a nice little user interface to manage the data in our accounts sample index.
LDAP Authentication Broken in Elasticsearch 8.18.0: The Entitlements Bug
LDAP Authentication Broken in Elasticsearch 8.18.0: The Entitlements Bug
Jochen Kressin || 2026-08-18
Elasticsearch 8.18.0 and 9.0.0 broke LDAP authentication with a NotEntitledException error. Learn what caused it and how to fix it.
Understanding Translog Recovery When a Failed Node Rejoins Your Elasticsearch Cluster
Understanding Translog Recovery When a Failed Node Rejoins Your Elasticsearch Cluster
Jochen Kressin || 2026-08-06
Learn how Elasticsearch handles translog recovery when a failed primary node rejoins the cluster after a replica has been promoted.
How Elasticsearch Checks for Document Existence with Custom IDs
How Elasticsearch Checks for Document Existence with Custom IDs
Jochen Kressin || 2026-07-21
Discover how Elasticsearch efficiently checks document existence when using custom IDs through shard routing and logarithmic terms dictionary lookups.
Encryption at Rest for Elasticsearch: The Complete Series
Encryption at Rest for Elasticsearch: The Complete Series
Daniel Gleim || 2026-07-16
The full Encryption at Rest series in one place: what it is, where it applies across industries, and how it maps to PCI-DSS, GDPR, SOX and more. Plus an FAQ.
Resolving Elasticsearch 9.0.1 Upgrade Issues with Custom Plugin Compatibility
Resolving Elasticsearch 9.0.1 Upgrade Issues with Custom Plugin Compatibility
Daniel Gleim || 2026-07-14
If you want to to upgrade from Elasticsearch 8.x to 9.0, you need to understand how plugin compatibility works and what to do when things don't go as planned
Elasticsearch Snapshot Restore Fails Despite Setting index.blocks.write: A Version Compatibility Deep Dive
Elasticsearch 8 to 9 Snapshot Restore Fails? The 7.x-Origin Index Trap and the Fix That Worked
Daniel Gleim || 2026-06-17
This scenario highlights a subtle but important aspect of cross-version compatibility that caught one user off guard during their upgrade from 8.7.1 to 9.0.1
Fast tracking compliance in Elasticsearch using Search Guard
Fast-Tracking Compliance in Elasticsearch Using Search Guard
Daniel Gleim || 2026-06-11
Search Guard provides security and compliance features directly inside the Elastic stack-configurable, integrated, and designed for regulated environments.
SG 26 BlogHeader Secure Sovereign
Cybernation Berlin 2026
Anja Glauch || 2026-06-01
Search Guard macht Elasticsearch-Cluster prüfungssicher: vom Login bis zur Verschlüsselung. Treffen Sie uns auf der Cybernation 2026 in Berlin.
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